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常见降压启动方法有（）（）（）（）等。

A. 转子串电阻降压启动
B. Y/Δ起动控制线路
C. 延边三角启动
D. 自耦变压器降压启动

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国共合作之下进行的北代战争所喊出的（）口号响彻大江南北。

A. 打倒列强，除军阀
B. 外争国权，内惩国贼
C. 打倒土豪，分田地
D. 停止内战，一致对外

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The passage is mainly about___________.

A. the life of Elvis
B. the history of American music
C. the development of rock and roll
D. the development of black African and the white European music

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The word “line” (Para. 3, underlined word) means ____________.

A. the rhythms of the work songs
B. a group of words in a passage
C. the strings of the guitar
D. a group of words in a song

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.It is difficult to say how “rock and roll” began because it came from so many different countries and so many different kinds of music and musicians.

A. 对
B. 错

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常见降压启动方法有（）（）（）（）等。

A. 转子串电阻降压启动 B. Y/Δ起动控制线路 C. 延边三角启动 D. 自耦变压器降压启动

国共合作之下进行的北代战争所喊出的（ ）口号响彻大江南北。

The passage is mainly about___________.

The word “line” (Para. 3, underlined word) means ____________.

.It is difficult to say how “rock and roll” began because it came from so many different countries and so many different kinds of music and musicians.

A. 转子串电阻降压启动
B. Y/Δ起动控制线路
C. 延边三角启动
D. 自耦变压器降压启动

国共合作之下进行的北代战争所喊出的（）口号响彻大江南北。